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checkds.py
############################################################################ # Copyright (C) Internet Systems Consortium, Inc. ("ISC") # # This Source Code Form is subject to the terms of the Mozilla Public # License, v. 2.0. If a copy of the MPL was not distributed with this # file, you can obtain one at https://mozilla.org/MPL/2.0/. # # See the COPYRIGHT file distributed with this work for additional # information regarding copyright ownership. ############################################################################ import argparse import os import sys from subprocess import Popen, PIPE from isc.utils import prefix,version prog = 'dnssec-checkds' ############################################################################ # SECRR class: # Class for DS/DLV resource record ############################################################################ class SECRR: hashalgs = {1: 'SHA-1', 2: 'SHA-256', 3: 'GOST', 4: 'SHA-384'} rrname = '' rrclass = 'IN' keyid = None keyalg = None hashalg = None digest = '' ttl = 0 def __init__(self, rrtext, dlvname = None): if not rrtext: raise Exception # 'str' does not have decode method in python3 if type(rrtext) is not str: fields = rrtext.decode('ascii').split() else: fields = rrtext.split() if len(fields) < 7: raise Exception if dlvname: self.rrtype = "DLV" self.dlvname = dlvname.lower() parent = fields[0].lower().strip('.').split('.') parent.reverse() dlv = dlvname.split('.') dlv.reverse() while len(dlv) != 0 and len(parent) != 0 and parent[0] == dlv[0]: parent = parent[1:] dlv = dlv[1:] if dlv: raise Exception parent.reverse() self.parent = '.'.join(parent) self.rrname = self.parent + '.' + self.dlvname + '.' else: self.rrtype = "DS" self.rrname = fields[0].lower() fields = fields[1:] if fields[0].upper() in ['IN', 'CH', 'HS']: self.rrclass = fields[0].upper() fields = fields[1:] else: self.ttl = int(fields[0]) self.rrclass = fields[1].upper() fields = fields[2:] if fields[0].upper() != self.rrtype: raise Exception('%s does not match %s' % (fields[0].upper(), self.rrtype)) self.keyid, self.keyalg, self.hashalg = map(int, fields[1:4]) self.digest = ''.join(fields[4:]).upper() def __repr__(self): return '%s %s %s %d %d %d %s' % \ (self.rrname, self.rrclass, self.rrtype, self.keyid, self.keyalg, self.hashalg, self.digest) def __eq__(self, other): return self.__repr__() == other.__repr__() ############################################################################ # check: # Fetch DS/DLV RRset for the given zone from the DNS; fetch DNSKEY # RRset from the masterfile if specified, or from DNS if not. # Generate a set of expected DS/DLV records from the DNSKEY RRset, # and report on congruency. ############################################################################ def check(zone, args, masterfile=None, lookaside=None): rrlist = [] cmd = [args.dig, "+noall", "+answer", "-t", "dlv" if lookaside else "ds", "-q", zone + "." + lookaside if lookaside else zone] fp, _ = Popen(cmd, stdout=PIPE).communicate() for line in fp.splitlines(): if type(line) is not str: line = line.decode('ascii') rrlist.append(SECRR(line, lookaside)) rrlist = sorted(rrlist, key=lambda rr: (rr.keyid, rr.keyalg, rr.hashalg)) klist = [] if masterfile: cmd = [args.dsfromkey, "-f", masterfile] if lookaside: cmd += ["-l", lookaside] cmd.append(zone) fp, _ = Popen(cmd, stdout=PIPE).communicate() else: intods, _ = Popen([args.dig, "+noall", "+answer", "-t", "dnskey", "-q", zone], stdout=PIPE).communicate() cmd = [args.dsfromkey, "-f", "-"] if lookaside: cmd += ["-l", lookaside] cmd.append(zone) fp, _ = Popen(cmd, stdin=PIPE, stdout=PIPE).communicate(intods) for line in fp.splitlines(): if type(line) is not str: line = line.decode('ascii') klist.append(SECRR(line, lookaside)) if len(klist) < 1: print("No DNSKEY records found in zone apex") return False found = False for rr in klist: if rr in rrlist: print("%s for KSK %s/%03d/%05d (%s) found in parent" % (rr.rrtype, rr.rrname.strip('.'), rr.keyalg, rr.keyid, SECRR.hashalgs[rr.hashalg])) found = True else: print("%s for KSK %s/%03d/%05d (%s) missing from parent" % (rr.rrtype, rr.rrname.strip('.'), rr.keyalg, rr.keyid, SECRR.hashalgs[rr.hashalg])) if not found: print("No %s records were found for any DNSKEY" % ("DLV" if lookaside else "DS")) return found ############################################################################ # parse_args: # Read command line arguments, set global 'args' structure ############################################################################ def parse_args(): parser = argparse.ArgumentParser(description=prog + ': checks DS coverage') bindir = 'bin' sbindir = 'bin' if os.name == 'nt' else 'sbin' parser.add_argument('zone', type=str, help='zone to check') parser.add_argument('-f', '--file', dest='masterfile', type=str, help='zone master file') parser.add_argument('-l', '--lookaside', dest='lookaside', type=str, help='DLV lookaside zone') parser.add_argument('-d', '--dig', dest='dig', default=os.path.join(prefix(bindir), 'dig'), type=str, help='path to \'dig\'') parser.add_argument('-D', '--dsfromkey', dest='dsfromkey', default=os.path.join(prefix(sbindir), 'dnssec-dsfromkey'), type=str, help='path to \'dnssec-dsfromkey\'') parser.add_argument('-v', '--version', action='version', version=version) args = parser.parse_args() args.zone = args.zone.strip('.') if args.lookaside: args.lookaside = args.lookaside.strip('.') return args ############################################################################ # Main ############################################################################ def main(): args = parse_args() found = check(args.zone, args, args.masterfile, args.lookaside) exit(0 if found else 1)
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